It has been recently demonstrated that regulatory CD4(+)CD25(+) CD45RO(+) T cells are present in the peripheral blood of healthy adults and exert regulatory function similar to their rodent counterparts. It remains difficult to understand how the small fraction of these T cells that regulate via direct cell-to-cell contact and not via secretion of… (More)

Due to a typographical error, the title of this article was originally published incorrectly. Unfortunately, a correction run in the August 19 issue (Vol. 196, No. 4, page 559) introduced an additional error. The correct version of the title appears below. Please note, the title appears correctly in the HTML and PDF versions of this article.